I have the m11x and a 92744 receiver in one car, works fine. I bought a 92451 for another car, copied the profile over from the one car, and set I up with everything 100 percent and zeroed. The throttle works as it should, but the servo centers and won't move. I checked the servo hooked up to the 92744 receiver and it's fine. Hooked up a different servo to the 92744 and same issue, it'll center but not move. Any ideas?

could be a analog or digital servo issue, maybe. look at the transmitter servo setup and try some other.

I tried that. I even tried other servos and nothing. Plugged the speed control in to the servo port and it worked fine. Gave up and took the receiver to airtronics. Hopefully they can figure something out.

do you have your steering servo set in shr or normal mode on the radio?

Shr. I tried it in normal and shr, no difference. And the servo works fine in my 92744 in shr mode.

Most digital servos wouldn't work in shr mode with a RX451R receiver, that's why I wondered if it could be the same with the 92744

You did think to first re-bind the receiver again when you changed the shr to nor of course.

Yeah. I binded the receiver numerous times. Even after plugging the esc in to the steering port. Just to make sure.